FAQ
Hi again.

I'm not sure if it makes any difference, but... mailman should resolve
a subdomain.

I have a contact.enterprise.com subdomain.

And I don't have any list.contact.enterprise.com.

I mean, Mailman should resolve directly the contact.enterprise.com

I have a MX record in enterprise.com DNS server pointing to
contact.enterprise.com.

And 'contact' machine is where the postfix/mailman is installed.

I still stuck on "User unknown in virtual mailbox table".

And I can't imagine why this error doesn't happen when I'm using an
account (even from another domain) hosted at the same
server/machine/postfix.

[]s
Alexander
Brazil

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  • Mark Sapiro at Dec 7, 2009 at 5:22 pm

    alexander at nautae.eti.br wrote:
    I'm not sure if it makes any difference, but... mailman should resolve
    a subdomain.

    Mailman is not a DNS server. It doesn't 'resolve' domains.

    I have a contact.enterprise.com subdomain.

    And I don't have any list.contact.enterprise.com.

    Actually, even the name server at ns1.enterprise.com has no A or MX
    records for either domain, contact.enterprise.com or
    lists.contact.enterprise.com.

    That raises the issue of how external mail even gets far enough to get
    a "Recipient address rejected: User unknown in virtual mailbox table"
    error.

    I mean, Mailman should resolve directly the contact.enterprise.com

    I have a MX record in enterprise.com DNS server pointing to
    contact.enterprise.com.

    Not that I can see?

    dig mx contact.enterprise.com @ns1.enterprise.com

    ; <<>> DiG 9.3.3rc2 <<>> mx contact.enterprise.com @ns1.enterprise.com
    ; (1 server found)
    ;; global options: printcmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 45783
    ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

    ;; QUESTION SECTION:
    ;contact.enterprise.com. IN MX

    ;; AUTHORITY SECTION:
    enterprise.com. 14400 IN SOA ns1.enterprise.com.
    dnsadmin.ent
    erprise.com. 2009111900 3600 1800 2592000 14400

    ;; Query time: 70 msec
    ;; SERVER: 65.197.19.32#53(65.197.19.32)
    ;; WHEN: Mon Dec 7 09:11:


    And 'contact' machine is where the postfix/mailman is installed.

    I still stuck on "User unknown in virtual mailbox table".

    And I can't imagine why this error doesn't happen when I'm using an
    account (even from another domain) hosted at the same
    server/machine/postfix.

    If I send mail to local_address at lists.contact.enterprise.com, there
    MUST be an MX or an A record in DNS for lists.contact.enterprise.com,
    or my MTA doesn't know where to attempt to deliver that mail. It
    doesn't 'fall back' to contact.enterprise.com or enterprise.com; it
    just gives up. All this has to work before the message will even get
    to the server that Mailman is running on.

    If the Mailman/Postfix server is contact.enterprise.com, you need an A
    record for contact.enterprise.com and an MX record for
    lists.contact.enterprise.com giving contact.enterprise.com as the
    target. Otherwise, the mail will never get to your server.
    Alternatively, you can have just an A record for
    lists.contact.enterprise.com giving the IP address of the server.

    You don't appear to have any of these DNS records.

    --
    Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan
  • Alexander at Dec 7, 2009 at 5:28 pm
    Mailman is not a DNS server. It doesn't 'resolve' domains.
    Yes, I know.

    I have a MX record in enterprise.com DNS server pointing to
    contact.enterprise.com.
    Not that I can see?
    My God!

    Sorry, I haven't said that the domain 'contact.enterprise.com' is only
    an example in this message.

    The real stuff is contato.edem.g12.br

    []s
    Alexander
    Brazil

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  • Mark Sapiro at Dec 7, 2009 at 6:01 pm

    alexander at nautae.eti.br wrote:
    Sorry, I haven't said that the domain 'contact.enterprise.com' is only
    an example in this message.

    Had you used one of the RFC 2606 recommended domains such as
    example.com or .invalid, I would have known they were examples only.

    --
    Mark Sapiro <mark at msapiro.net> The highway is for gamblers,
    San Francisco Bay Area, California better use your sense - B. Dylan
  • Alexander at Dec 7, 2009 at 6:07 pm

    Had you used one of the RFC 2606 recommended domains such as
    example.com or .invalid, I would have known they were examples only.
    Ok, ok, lesson learned.

    Whata shame...

    Sorry!

    []s
    Alexander
    Brazil

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  • LuKreme at Dec 7, 2009 at 5:57 pm

    On 7-Dec-2009, at 09:33, alexander at nautae.eti.br wrote:
    I have a contact.enterprise.com subdomain.
    Please don't use real (or even potentially real) domains when you are trying to obfuscate your own domains. You have three, and ONLY three choices:

    1) Use the real domains. In most cases, this is a good choice as it allow people to do things like check your DNS, your rDNS, etc.

    2) Use example.com example.org or example.net

    3) use a made up domain ending in a made-up non-existing tld. For example, I would have said
    I have a contract.enterprise.tld subdomain.

    tld stands for top-level domain and is not a valid tld. If you go with #3 you have to be POSITIVE that the tld you use is not used, potentially used, or under review to be added. .xxx is a terrible choice for these reasons. .tld .moc .example are all reasonable choices

    In the example you gave, enterprise.com is a domain name for Enterprise Rent a Car.

    --
    I believe you can joke about anything. -- George Carlin

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postedDec 7, '09 at 4:33p
activeDec 7, '09 at 6:07p
posts6
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3 users in discussion

Alexander: 3 posts Mark Sapiro: 2 posts LuKreme: 1 post

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